Gamer- Not sure what a 475 should run exactly, it depends on your set-up. In general, the K6/2xxx should have a max of 60-65deg.C as recommended by AMD. Not sure about your mobo temp. My K62/450 runs @30-33C during normal use. After intense 3d gaming, it gets up to 43C. I'm running a factory heatsink/fan, 5 case fans, and Rain ver2.0 to keep it cool. I have had no problems with screen lock-ups. Get an oversize heatsink/fan like an ALPHA if your temp is to high, It will help alot. Also, you could try overclocking to 500mhz by changing your FSB to 100mhz instad of 95. You should be able to get that easily with a good heatsink and it might be more stable that way instead of the 95mhz FSB. Worth a try. Hope this helps! Good luck!!!
Main DVD MM Rig:
CoolerMaster Storm Scout
AM3 Phenom II x4 955BE @ 3.6 ghz
Corsair H50 Watercooling kit
4.0 GB AData DDR3
GIGABYTE GA-MA770T-UD3P Mainboard
Western Digital 750GB 7200rpm w/32mb cache
Samsung 750GB 7200rpm w/32mb cache
Western Digital 1.0TB 7200rpm w/32mb cache
LG 20x DVDRW-DL "SuperDrive"
PNY GeForce 9800gt 1024mb w/Samsung 245BW 24" LCD
Corsair 620w Modular Power Supply
Logitech z-640 5.1's
Logitech Wireless Mouse
Win 7 Ultimate........